Implement AnchorKit config preset validator

[El-swaggerito]

Description

Difficulty: Expert

Type: Feature

Summary

Implement validation for AnchorKit configuration presets.

Current Behaviour

Config presets may not consistently validate network, endpoints, feature flags, and environment assumptions.

Expected Behaviour

AnchorKit should validate configuration presets before they are used by examples or apps.

Suggested Implementation

Create preset schema, validator, typed errors, tests, and documentation.

Files or Areas Likely Affected

• packages/config/
• packages/validators/
• apps/web/
• examples/
• tests/
• docs/

Acceptance Criteria

• Config preset validator is implemented.
• Network and endpoint values are validated.
• Feature flags are validated.
• Invalid config returns typed errors.
• Tests cover valid and invalid presets.
• Docs explain preset usage.

Additional Notes

This reduces contributor setup problems.

[panditdhamdhere]

Can I implement this ?